Digital Theodolite | Digital Theodolite | |
Digital Theodolite | Digital Theodolite | |
Sunday 29 November 2009
Digital Theodolit Sokkia
Friday 27 November 2009
During the 2009 visit of the SA Agulhas, Jürgen Matzka from Denmark, Alan Berarducci from the US and Bjorn Ove Husoy from Norway visited Tristan to finalize the magnetometer station on Tristan da Cunha.
The station was started in 2008 by Leo Gening from Enviroconsult and now, in its final setup, measures the magnetic field of the Earth every second. To deliver data according to the highest standards, Robin Repetto (who is also station manager) and Jason Green were trained to perform weekly calibration measurements with a theodolite. The other two instruments of the station are a Danish FGE magnetometer, located in a pyramide shaped shelter and sending online data to the oiutside world, as well as a Candian GSM magnetometer that measures the magnetic field strength. The project is a cooperation of several institutes and mainly funded by the Danish Agency for Science, Technology and Innovation.
In the South Atlanic, the magnetic field is too steep and too much easterly directed, too weak and still decreasing, says Jürgen Matzka. We want to learn more about the processes in the core of the Earth that are responsible for the weakening magnetic field, but also study the consequences this has for the interaction between planet Earth and space. Similar stations are on Ascension, St. Helena, the Falklands, Hernamus and Sao Paulo. In 2011, three satellites will be sent into space in ESA’s Swarm mission to measure the magnetic field, and the magnetometer station on Tristan da Cunha will be one of the ground stations for this.
We would like to say thank you to all of you for helping making the Magnetometer Station work successfully. Thanks to the Tristan da Cunha administration, Island Council and the whole community for their permission and support. Thanks to our station manager Robin and operator Jason and all people involved offloading and building the station. Thanks for electrical support, carpentry, internet and bringing the stones away from the field around the station and all the other things. Very imprtantly, thanks for all the advice we got on how to proceed with the station to make it fit into the Tristan community. And finally thanks to James and Felicity, for their great hospitality throughout our stay.
Monday 23 November 2009
funny theodolite
Where someone be confused, they will go to something that can make them fell comfortable. one of it is by riding comics or watch some funny pictures. like this...Tuesday 17 November 2009
The Marines manually track the balloon with an electronic magnetic meteorological theodolite
They're few, they're silent and they can't be detected, but they can track a 60mm mortar round from several miles away.
More than 25 Marines from target acquisition platoon, 12th Marine Regiment, 3rd Marine Division, III Marine Expeditionary Force, combed the ranges of the North Fuji Maneuver Area, Nov. 2-10, to practice their skills in locating enemy indirect firing positions and collecting weather information during Artillery Relocation Training Exercise 09-03.
Of the two sections, radar and sensors, the radar section uses state-of-the-art technology to locate and track indirect fires from enemy positions and determine where the shots originate. In turn, acquired target locations are forwarded to an artillery unit's fire direction center to calculate how to eliminate the threat, according to Chief Warrant Officer 2 John Crites, officer-in-charge of the platoon.
"If we tell you where the enemy shot from, you can bet that's where they're going to be," said Crites who hails from Chicago, Ill.
In reference to artillery, the 'King of Battle,' may be the heavy weights in the fight, but without the information acquired by the target acquisition platoon and the forward observers, the guns would be at a stand still, according to Crites.
The tools the radar section uses for success includes a counter battery radar, a lightweight counter mortar radar and a ground counter fire system that analyzes acoustic sound to locate enemy positions.
During the exercise, the Marines performed tactical day and night movement that included setting up and tearing down their equipment within minutes. In addition, the Marines were careful in selecting each site by considering the radars' ability to observe the battle space, and also local security capabilities such as entry and exit routes and defensive firing positions, Crites added.
Within the platoon, the meteorological team plays an important role in the battlefield as well. One of the ways these Marines collect meteorological data is by using the piloted balloon method.
According to Cpl. Mark Castro, a meteorological Marine with the regiment, the Marines monitor the ascent of a helium-filled balloon at various time intervals. As the balloon changes direction, the team determines the wind's speed and direction. The Marines manually track the balloon with an electronic magnetic meteorological theodolite, a telescope used for measuring horizontal and vertical angles, with the observed azimuth and elevation angles recorded at certain time intervals. Additionally, the Marines factor in predetermined surface temperature and atmospheric pressure from Department of Defense chart tables of the region.
For the gun line, weather data plays an important role in firing accuracy. It determines how the battery will send rounds down range, according to Castro.
According to Col. Keil Gentry the commanding officer of 12th Marines, there has been nearly an 80 percent turnover in personnel from the regiment.
"For most of the Marines and sailors here, this is their first trip to the Fuji area," Gentry said.
Despite the majority of the sections being new, their leaders were proud of the performance of the Marines.
"For some of my guys, this was their first time out in the field, so it was a good opportunity to hone our skills and build a cohesive team from the bottom up," said Sgt. Dennis Littlepage, non-commissioned officer-in-charge of the target acquisition platoon.
More than 25 Marines from target acquisition platoon, 12th Marine Regiment, 3rd Marine Division, III Marine Expeditionary Force, combed the ranges of the North Fuji Maneuver Area, Nov. 2-10, to practice their skills in locating enemy indirect firing positions and collecting weather information during Artillery Relocation Training Exercise 09-03.
Of the two sections, radar and sensors, the radar section uses state-of-the-art technology to locate and track indirect fires from enemy positions and determine where the shots originate. In turn, acquired target locations are forwarded to an artillery unit's fire direction center to calculate how to eliminate the threat, according to Chief Warrant Officer 2 John Crites, officer-in-charge of the platoon.
"If we tell you where the enemy shot from, you can bet that's where they're going to be," said Crites who hails from Chicago, Ill.
In reference to artillery, the 'King of Battle,' may be the heavy weights in the fight, but without the information acquired by the target acquisition platoon and the forward observers, the guns would be at a stand still, according to Crites.
The tools the radar section uses for success includes a counter battery radar, a lightweight counter mortar radar and a ground counter fire system that analyzes acoustic sound to locate enemy positions.
During the exercise, the Marines performed tactical day and night movement that included setting up and tearing down their equipment within minutes. In addition, the Marines were careful in selecting each site by considering the radars' ability to observe the battle space, and also local security capabilities such as entry and exit routes and defensive firing positions, Crites added.
Within the platoon, the meteorological team plays an important role in the battlefield as well. One of the ways these Marines collect meteorological data is by using the piloted balloon method.
According to Cpl. Mark Castro, a meteorological Marine with the regiment, the Marines monitor the ascent of a helium-filled balloon at various time intervals. As the balloon changes direction, the team determines the wind's speed and direction. The Marines manually track the balloon with an electronic magnetic meteorological theodolite, a telescope used for measuring horizontal and vertical angles, with the observed azimuth and elevation angles recorded at certain time intervals. Additionally, the Marines factor in predetermined surface temperature and atmospheric pressure from Department of Defense chart tables of the region.
For the gun line, weather data plays an important role in firing accuracy. It determines how the battery will send rounds down range, according to Castro.
According to Col. Keil Gentry the commanding officer of 12th Marines, there has been nearly an 80 percent turnover in personnel from the regiment.
"For most of the Marines and sailors here, this is their first trip to the Fuji area," Gentry said.
Despite the majority of the sections being new, their leaders were proud of the performance of the Marines.
"For some of my guys, this was their first time out in the field, so it was a good opportunity to hone our skills and build a cohesive team from the bottom up," said Sgt. Dennis Littlepage, non-commissioned officer-in-charge of the target acquisition platoon.
Thursday 12 November 2009
Heinrich Wild’s optical theodolite, introduced in Switzerland in the 1920s, had several new features, including an auxiliary telescope
Leonard Digges introduced the word "theodolitus" in his Pantometria (London, 1571). This surveying instrument had a circular ring or plate divided into 360 degrees, and a pivoting alidade with sight vanes at either end. Theodolites of this sort, as well as others with a second pair of sight vanes affixed to the graduated circle, were soon in widespread use. In 1791, George Adams Jr. called this instrument a "common theodolet," reserving the term theodolite for the telescopic instruments with horizontal circles and vertical arcs that had been introduced in London in the 1720s. While the telescopic theodolite was popular in England, Americans preferred the surveyor’s compass and, later, the surveyor’s transit, which were cheaper and more robust. In the 18th century form, the telescope is mounted directly on the vertical arc. In the transit theodolite, which originated in London in the 1840s, the telescope is transit mounted, with a vertical circle mounted at one side. Heinrich Wild’s optical theodolite, introduced in Switzerland in the 1920s, had several new features, including an auxiliary telescope that lets the user read either circle without moving away from the station.
Some theodolites measure horizontal angles with geodetic accuracy. The first instrument of this sort was made by Jesse Ramsden in London in 1787, and purchased by the Royal Society for use on the geodetic link between Greenwich and Paris. The first instrument of this sort in America was made around 1815 by Troughton in London for the fledgling United States Coast Survey.
Ref:
J. A. Bennett, The Divided Circle (Oxford, 1987), pp. 40–41, 146–149, 195–200.
George Adams Jr., Geometrical and Graphical Essays (London, 1791), pp. 220–222 and fig. 5.
Some theodolites measure horizontal angles with geodetic accuracy. The first instrument of this sort was made by Jesse Ramsden in London in 1787, and purchased by the Royal Society for use on the geodetic link between Greenwich and Paris. The first instrument of this sort in America was made around 1815 by Troughton in London for the fledgling United States Coast Survey.
Ref:
J. A. Bennett, The Divided Circle (Oxford, 1987), pp. 40–41, 146–149, 195–200.
George Adams Jr., Geometrical and Graphical Essays (London, 1791), pp. 220–222 and fig. 5.
Wednesday 4 November 2009
Mounted on the azimuth axis is a magnetic compass
We are proud to offer this beautifully detailed functional and calibrated solid brass reproduction of a precision theodolite. Theodolites are still used today for ultra high precision optical alignment and measurement. There is a spirit level and three adjustable legs for fine leveling. The azimuth and elevation axes can be read on a vernier scale with the assistance of built-in magnifiers. To reduce bearing errors each axis has slow motion controls and the telescope can plunge and reverse. The azimuth axis has a second spirit level mounted on the telescope with a mirror to aid in leveling. Mounted on the azimuth axis is a magnetic compass. The azimuth scale is 5 1/4 inches (13.3 cm) in diameter and the elevation scale is 4 3/4 inches (12.1 cm) in diameter. The theodolite's 22-power non-inverting telescope has two focusing adjustments; one for the precision reticule focus and the other for focusing the target. The telescope uses precision optics and has a brass lens cover. The telescope measures 8 inches (20.3 cm) long. The solid brass theodolite measures 13 1/2 inches (34.3 cm) tall, and weighs 16.4 pounds (7.45 kg).
The theodolite comes complete with a beautiful hardwood case as well as a teak and brass surveying tripod. The teak tripod contains a second round spirit level and the height is adjustable up to a maximum height of 5 feet, 9 1/2 inches (177 cm) with a maximum eye height of 5 1/2 feet (168 cm). The theodolite mount uses large 3 1/4 inch (8.25 cm) diameter course thread. The theodolite and tripod weigh 30 pounds (13.6 kg).
In addition to the tripod , a beautiful solid hardwood case is included to store and carry the theodolite. The case has storage for accessories and includes a plumb. The case features an internal lock and the case measures 16 1/2 inches (41.9 cm) long, 8 3/4 inches (22.2 cm) deep, 7 1/4 inches (18.4 cm) tall, and weighs 8 pounds (3.6 kg). Note that this theodolite is fully functional and certified accurate for surveying.
The Polished Brass Theodolite, hardwood case, and teak tripod is offered for $2,375.
Sunday 1 November 2009
Search Geographic Surveying Instrument products in China, Search Geographic Surveying Instrument manufacturers & suppliers in China;
Product Description
Laser Theodolites DE series can be convenient to focus and adjust the laser brightness and you can order laser plummet as you like. Also, the laser brightness and focus are adjusted.
More Product Features
Trademark: UNICOM-OPTICS or Neutral English
Model NO.: DE5B-L
Standard: Iso
Productivity: 5,000pcs/year
Unit Price/Payment: FOB USD935.00/pc
Origin: Tsingtao
Packing: Carton
Min. Order: 1
Transportation: By Air
Company: Tsingtao Unicom-Optics Instruments Co., Ltd.
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